DE1663148A1 - Electrical switching device for the drive motor of a washing machine - Google Patents

Description

Electrical switching device for the drive motor

a loom

The invention relates to an electrical switching device for the drive motor of a weaving machine, which can be switched to reverse, the shafts of which form the shed by a first drive shaft connected to the motor and its other weaving devices, such as looper needles and loading, are driven by a second drive shaft coupled to the first drive shaft, the coupling between the first and second drive shaft when the first one rotates backwards from a predetermined angular position Drive shaft disengages automatically

Electrical switching devices are already known through which the normal weaving process automatically interrupts when a weaving irregularity occurs, for example a thread break, and then the drive of the loom is automatically continued in the reverse weaving direction until the various weaving devices, such as in particular the shed forming shed, the quiver needles and the jiade, • reach a predetermined position in which the weaving irregularity can be lifted.

riofatOBg ie * for example in the Teitienfaen Patentaehrift «73 96 * keeohrieee *

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A switching device of this kind already facilitates the elimination of web irregularities to a certain extent » However, if, for example, several successive weft threads are defective or if several more weft threads are inserted after a single defective weft thread, Before the machine comes to a standstill, it must be remedied even if such a switching device is used the weaving irregularity nocit relatively laborious and time-consuming The invention is therefore based on the object to further develop a switching device of the type mentioned at the beginning, that the rectification of web irregularities will be made easier than before »

This object is inventively achieved in that a reverse drive controlling circuit of the switching means comprises a normally closed main contact and a same bridging normally open HiIfS - * having "contact, and in that a controlled by the first drive shaft switch opens the main contact and by exciter ^ ■■ - the supply of an auxiliary relay causes the auxiliary contact to close when the first drive shaft is in or near its specified angular position, whereby a switch for step-by-step reverse drive prevents the auxiliary relay from being excited when it is actuated »

By the switching device according to the invention, the Drive the loom after a weaving irregularity first control the interruption of the weaving process by pressing a a pushbutton switch so that that all weaving devices either in the normal weaving direction from their position just present at standstill or in the opposite direction to get into the specified position. According to the invention, it is then still possible by pressing the push-button switch again, only that To drive shed forming shafts in the opposite direction,

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the same predetermined position being reached again in each case o This separate backward movement of the shed can be repeated any number of times, whereby the shed comes to a standstill each time in the specified position the removal of larger or more distant weaving irregularities is also greatly facilitated

An embodiment of the invention is shown in the drawing Illustrates it show:

Pig · 1 a side view of a loom with which he- switching device according to the invention;

Fig. 2 is a partially sectioned along the line II-II of Pig x 3 Top view of the loom

Pig. 3 a detail of the Pig 1 on an enlarged scale (in normal working position);

Pig. 4 the detail according to Pig »3 (during the backward movement of the shed);

Pig 5 a circuit diagram of the electrical switchgear *

The loom shown in Pig 1 contains a frame 1 with a position 2 _t which can pivot about a horizontal axis 3 and which carries a comb 4. Looper needles 6 and 7 are used to insert the weft threads. They are actuated by drive elements 11 and 12 of cam disks 13, 14, which sit on a drive shaft 15 rotatably mounted in the frame 1 (hereinafter referred to as the "second drive shaft") · The drive shaft 15 is connected to the slack 2 via connecting rods 18, 19. , 23 »whose up and down movement is effected by two levers 24, 25 which are driven by cam disks 26, 27 seated on a shaft 28 · The warp

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threads 31 run from the warp beam 34 over a backrest 32 and a pad carrier tree 33 through the shed formed by the shafts 22, 23 and the comb 4 of the drawer 2 »the fabric 37 is wound on a winder 38 »

An electric motor 45 drives a pulley 46, a Belt 47 and a pulley 48 to a hollow shaft designed as a drive shaft 48a, hereinafter referred to as "first Drive shaft "is designated · The mentioned second drive shaft 15 is freely rotatably mounted in the first drive shaft 48a · A disk 51 and a toothed wheel 52 are seated on the drive shaft 48a and are connected via a chain 53 to one on the shaft 28 arranged gear 50 is connected · By the first drive shaft 48a is formed by the shafts 22, 23 Shed actuated, while the drive of the drawer 2 and the hook needles 6 and 7 takes place from the second drive shaft 15.

Between the two drive shafts 48a and 15 a coupling 54 is provided which contains a pawl 55 (see Pig 3 and 4) This pawl 55 is pivotably mounted on the cam disk 13 by means of an axis 56, which is fixed to the second drive shaft 15 is connected · The pawl 55 has at one end an inwardly directed tooth 55a, which under the action of a spring 58 can engage in a recess 57 provided on the circumference of the disc 51 · One end of the spring 58 is on a pin 61 of the The cam disk 13 and the other end of the teder are attached to a pin 62 of the pawl 55 The pawl 55 widens a shoulder 55b on the side of the axle 56 facing away from the tooth 55a and is also provided with an outwardly directed pinger 63

Hn Ansehlag 65 is pivotable about an axis 66 and can hence either the Buhelage shown in pig · 3 or the

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in the working position illustrated in Pig · 4- o For actuation the stop 65 is an electromagnet Β1 · Opposite the movable stop 65 is a fixed stop 67 arranged «Between the two stops 65» 6? is the actuating roller 71 of an interrupter S1 »

The second drive shaft 15 carries a cam disk 73 » to control an interrupter S2 provided with an actuating roller 74 · The one with the first drive shaft 48a connected disk 51 carries a squat 75 »the Control of a switch §3 provided with an actuating roller 72 serves · The interrupter S2 and the switch S3 are arranged on a lever 76 which can be pivoted about an axis 77 by an electromagnet E2 »The electromagnet E2 engages the lever 76 via an arm 78. Is the electromagnet Ξ2 energized »so the actuating rollers 72 and 74 are outside the range of motion of the cam 75 or» of the cam disk 73

The circuit diagram of the switching device according to the invention shown in FIG. 5 shows the electric motor 45 which can be connected to the three-phase network RSX either via a gate relay AV or a reverse relay AR of the motor 45, a brake drum 82 is connected to which a brake pad 83 is pressed by a pedal 84 "when the electromagnet"? is not energized In the circuit of the electromagnet P there are auxiliary _{contacts av r} ar of the Relaia AT or AR

Furthermore, the circuit contains an isolator M _9, an opening switch S, a relay Z with the contacts x1, z2 and x3, an auxiliary relay T with the auxiliary contacts y1, y2, a warp thread breaker 10 and a warp thread breaker relay »

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O with contacts c1 and c2, furthermore a weft thread breaker IT and a weft break relay T with contacts: ti, t2, a push button switch for stepwise gate drive with contacts IAV1 and IAY2 and a push button switch 2Ur stepwise reverse drive with contacts ZAHf and IAR2 »

In the following, the mode of operation of the switching device will first be described explained in normal operation

If neither a weft thread nor a warp thread is broken, the switches IC and IT are closed and the relays C and I are not energized. x2 and x3 »The forward relay AT receives voltage via contact x1 · Contact x2 serves as a self-holding contact for relay X after it is released, the age M» Via contact x3, the electro-magnets £ 1 and £ 2 are excited so that the stop 65, the interrupter S2 and the switch S3 are swiveled upwards (? ig 3) and thus do not become effective when the drive shafts 15 and 48a rotate

To stop the loom, press the switch S, whereby the relay X is de-energized · Opening the contact x1 interrupts the excitation of the gate relay AT * By opening the auxiliary contact av, the electromagnet J is de-energized, so that the motor is braked »

In the following, let the jail be entrusted with the fact that during the normal running of the loom a warp thread breaks »This activates the interrupter IC so that the gate relay AT de-energized and the warp thread breakage relay 0 energized becomes · The opening · contact o2 makes relay Z de-energized, do that its contact x1 opens · This is the

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The circuit of the AT TorwärtsrelaiB is still on. a second place interrupted, so that even if the warp thread breaker IC returned to the rest position illustrated in Pig »5 very quickly after the occurrence of a warp thread break returns, the forward relay AV as a result of the open Contact x1 remains de-energized * The warp thread brewing relay C is held via contact c1

Marriage after removing the weaving irregularity can be switched on again, the off switch S must first be operated to hold the relay C to interrupt »If a weft thread break occurs during normal operation», the shutdown of the weaving machine is very similar Initiated by the weft break interrupter IT *

If the electric motor 45 is caused by a weaving irregularity » for example “inen Schußfaäeribruch, in the one explained above Way via the relay Z opening the Kc: clock xi has been stopped and the »s & t - j ^ disk 51 revolving Cam 75 is still angularly removed from switch A3, so nan actuates either the one with contacts IAT1 and IAT2 provided switch for stepwise forward drive or the switch provided with contacts IAR1 and IAR2 for gradual reverse drive »This will either the forward relay AT or the reverse relay AR via the normally closed main contact S3a of the switch S3 energized · If the relay AT is energized, the drive shafts 15 and 48a are rotated in the forward direction, while at Excitation of the relay AR both drive shafts in reverse direction run * The curl 75 is approaching as a result in one or other direction the switch S3 · The one through the closed Xontakt IAR1 or IAV1 of the one you just pressed The circuit formed by the switch for the forward relay AT or the reverse relay AR is interrupted when the main

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contact S3a is opened by cam 75 * In this The drive shafts 15 and 48a therefore remain at the predetermined angular position. The shed is in this angular position opened

If the previously operated pushbutton switch (with the Contacts IAV1, IAV / 2 or IAR1 »IAR2) enabled, see above If the contact IAV2 or IAR2, which is open during actuation, closes the excitation circuit of the auxiliary relay Y »This relay is now via the closed second contact S3b of switch S3 excited so that the auxiliary contact y2 closes and in this way bridges the open main contact S3a O

If you now press the push-button switch for stepwise forward drive (with contacts IAV1, IAV2), this will be Forward relay AV via the closed auxiliary contact y2 energized, so that from the predetermined angular position, both shafts 48 and 15 move in the forward direction

If, on the other hand, the push-button switch for stepwise reverse drive is operated (with the contacts IAR1, IAR2), the reverse relay AR receives voltage, so that the first drive shaft 48a begins to run in the reverse direction (that is, against the direction of the arrow f1 according to FIG. 4) Relay X is not energized, the contact x3 is open and the electromagnet E1 is thus de-energized »The stop 65 is thus in the inwardly pivoted position according to fig. 4 * It therefore prevents the pawl 55 and thus the second drive shaft 15 connected to it from following the disk 51 rotated by the first drive shaft 48a (against the arrow f1). The tooth 55a of the pawl 55 consequently emerges from the recess 57 of the disk 51, so that the coupling between the two drive shafts 15 and 48a is interrupted.

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The second drive shaft 15 and the parts of the loom connected to it “in particular the drawer 2 and the looper needles 6 and 7, as a result, remain in the position reached, while those with the shed (shafts 22, 23) connected first drive shaft 48a executes a full revolution in the reverse direction »After this revolution, the Cam 75 again on the actuating roller 72 of the switch S3, so that the excitation circuit of the reverse relay AR is interrupted by the main contact S3a (the auxiliary contact y2 connected in parallel is opened beforehand if at the beginning of said rotation of the cam 75 from the switch S3 expires, so that the excitation of the auxiliary relay Y by the Contact S3b is interrupted} «

In both cases (doh «> both when a common rotation of the shafts 15, 48a in the gate direction and then, if there is only one revolution of the shaft 48a in the reverse direction) one of the two contacts IAT2 or IAR2 remains during this rotation opened, so that by closing the contact 33b again (when the Cam 75 on the actuating roller 72 of the switch S3) the auxiliary relay Y is not energized o The motor 45 comes along after such a rotation back to a standstill »

You can now drive this step-by-step forwards or backwards by pressing the corresponding pushbutton switch again (with contacts ΙΑΥΊ, IAV2 or IAR1, IAR2) as often as desired and in this way the web irregularities that have occurred (for example several Quickly remove torn sole threads

It may now be that the drive shafts 15, 48a come to a standstill in an angular position after a weft or warp thread break come, which has a large angular distance from the specified angular position mentioned (Pig. 3). if under these circumstances the loom in reverse

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would run drive make, the gripper needles could not in this fall actuation of Sehalters for gradual reverse drive (with the contacts IAR1 "IAE2) into the not yet sufficiently open shed penetrate" _Um ineffective bdrm, in the exciting circuit of the reverse relay Ar is still the interrupter S2 is provided, which in this case is opened by the cam disk 73 o Under the circumstances mentioned, the switch for step-by-step forward drive (with contacts IAV1, IAV2) is actuated so that the loom moves forward in the specified angular position (l? igo 3) runs in «From this angular position, the shed can be driven in the backward direction in the manner explained by operating the switch for stepwise reverse drive (contacts IAR1, IAS2)

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Claims (1)

1663U8 P a t e η t a η s ρ r ü c h e: 1.Electric switching device for the drive motor of a weaving machine, which can be switched to reverse, whose shafts forming the shed are driven by a first drive shaft connected to the motor and the other weaving devices, such as G-riper needles and iade, are driven by a second drive shaft coupled to the first drive shaft, wherein the coupling between the first and second drive shaft disengages automatically when the first drive shaft rotates backwards from a predetermined angular position, characterized in that a circuit of the switching device controlling the reverse drive has a normally closed main contact (S3a) and a normally open auxiliary contact (S3a) bridging the same. y2), and that a Sehalter (S3) controlled by the first drive shaft (48a) opens the main contact uad by excitation of an auxiliary relay (Y) the closing of the auxiliary contact - causes _s when the first drive shaft is in or near its Yorg e given angular position is, whereby a switch (IAR) for stepwise reverse drive prevents the excitation of the auxiliary relay when actuated «. 2. Switching device according to claim 1, characterized in that the circuit controlling the Vorwärtsaantrieb Switching device through a branch line to the reverse drive controlling circuit is connected, with a switch (IAV) for step-by-step Torwärtsanrielj in the actuated state the branch line closes and the excitation of the auxiliary relay (Y) is prevented. 3 * switching device according to claim ί, characterized in that that the circuit controlling the reverse drive is one normally closed breaker (S2), the BATH 1 09 8 3 2/03 4 9 ■ -. " is opened by a cam disk (73) rotating with the second drive shaft (15) when both drive shafts located in one of the predetermined angular division of the first drive shaft (48a) substantially distant Angular position. Switching device according to Claim 1, characterized in that the coupling (54) is between the two drive shafts (15> 48a) by a swivel-mounted cam disk (13) which is fixedly connected to the second drive shaft Ü5) Locking pawl (55) is formed which resiliently fits into a recess (57) in one with the first Drive shaft (48a) firmly connected circular disc (51) has pressed tooth (55a) and a shoulder (55b) » which rests against the edge of the disc (51) when the tooth is outside the recess, and that the pawl also has a pinger (63), which is directed towards the side facing away from the 2-tooth (55a) and when driving backwards to one when driving forward drive pushes the retractable stop (65) «, Switching device according to claim 4 »characterized in that that opposite the retractable stop (65) a Pinger (63) more firmly in the direction of the forward drive a fixed stop (67) is provided » Switching device according to Claims 1, 2 and 4, characterized characterized in that in normal operation of the loom retractable stop (65) by a first electromagnet a (E1) and the one controlled by the first drive shaft (48a) Switch (S3) and the interrupter (S2) controlled by the second drive shaft (15) by a second one Electromagnet (E2) moved out of its working position are" 283 - Hf 1 09 83 2/03 49